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Swing temperature and alternating airflow fixed-bed (STAA-FB) drying significantly improved drying uniformity and drying capacity. The effects of tempering and alternating flow on the thermal efficiency () of wheat drying at different bed heights at different stages were studied through experiments. Then the effects of tempering parameters (including tempering temperature, tempering time and tempering airflow speed) and drying airflow onat different bed heights were analyzed. The totalat the end of drying under different tempering parameters and drying airflow was compared. Compared with the control experiment,increased by 3.77%, 7.25%, and 1.04% respectively by prolonging the tempering time, increasing tempering airflow speed in a short time, and increasing the airflow speed in each stage.decreased by 12.09% by increasing the temperature in the tempering stage. Then the heat consumption () under different drying conditions was analyzed. At last, theanalysis of fixed-bed (FB), alternating airflow fixed-bed (AA-FB), STAA-FB, spouted-bed (SB), and fluidized-bed drying (FLB) were studied. In fixed-bed drying, theof FB significantly higher than that of AA-FB and STAA-FB. Reducing the inlet temperature can significantly reduce theof AA-FB, but drying time of AA-FB increased sharply. Theof FLB and SB higher than that of STAA-FB.

Thermal efficiency and heat consumption analysis in deep-bed drying